gut-wrenchingly       
adverb uk/ˈɡʌtˌrentʃ.ɪŋ.li/ us/ˈɡʌtˌrentʃ.ɪŋ.li/
 令人非常痛苦地;令人非常害怕地
in a way that makes you feel extremely sad, shocked, or upset
  This deeply moving and gut-wrenchingly convincing film tells his story. 这部感人至深、令人胆战心惊却又真实可信的电影讲述的是他的故事。 
 There are gut-wrenchingly steep drops, and no barriers. 陡峭落差令人胆寒,而且没有护栏。 
 - More examples
 - It is one of the simplest yet most gut-wrenchingly compelling documentaries in a long while.
 - To us, the death penalty is gut-wrenchingly vile in any form.
 - The justice spokeswoman said it was a "gut-wrenchingly appalling case".